# CVE-2020-5759: Command injection in Grandstream UCM6200 Series

> Authenticated attackers can execute arbitrary commands as root on Grandstream UCM6200 devices via SSH command injection.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-559m-xqw9-mvgm

## What is CVE-2020-5759?

CVE-2020-5759 is a critical command injection vulnerability in Grandstream UCM6200 Series, published on 17 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. An authenticated remote attacker can execute commands as the root user by issuing a specially crafted "unset" command.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2020-5759?

It affects 3 products.


Products: Grandstream Ucm6202 Firmware, Grandstream Ucm6204 Firmware, Grandstream Ucm6208 Firmware.

## How do I fix CVE-2020-5759?

No fix has been published for CVE-2020-5759 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5759 being exploited?

There is no known exploitation of CVE-2020-5759 in the wild and no public exploit code.

## Other vulnerabilities in Grandstream UCM6200 Series

- [CVE-2020-5757](https://insights.sbomify.com/CVE-2020-5757/): Command injection in Grandstream UCM6200 Series (critical 9.8)
- [CVE-2020-5723](https://insights.sbomify.com/CVE-2020-5723/): Information disclosure in Grandstream UCM6200 series (critical 9.8)
- [CVE-2020-5758](https://insights.sbomify.com/CVE-2020-5758/): Command injection in Grandstream UCM6200 Series (high 8.8)
- [CVE-2020-5724](https://insights.sbomify.com/CVE-2020-5724/): SQL injection in Grandstream UCM6200 series (high 7.5)
- [CVE-2020-5726](https://insights.sbomify.com/CVE-2020-5726/): SQL injection in Grandstream UCM6200 series (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5759 and fix it if it is affected.

What it is: CVE-2020-5759 is a critical command injection vulnerability in Grandstream UCM6200 Series, published on 17 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5759 in the wild and no public exploit code.

Affected product: Grandstream UCM6200 Series. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-5759/ (Markdown: https://insights.sbomify.com/CVE-2020-5759/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5759
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5759
- OSV: https://osv.dev/vulnerability/CVE-2020-5759

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5759/
Summaries are generated and may contain mistakes; the official description above is the record.